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1. PS/2 Mouse Port
This green 6-pin connector is for a PS/2 mouse.

2. Parallel Port
This 25-pin port connects a parallel printer, scanner, or other devices.

3. Side Speaker Out
This black jack connects to the side speakers on 4-channel or better audio configurations.

4. Center/Subwoofer Port
This orange jack connects to a subwoofer / center channel speaker.

5. Line-In Jack
This light blue jack connects a to an audio input source.

6. Line-Out Jack
This lime jack connects to speakers or a headphone.

7. LAN Port 1 (RJ-45)
This port allows up to 1000 Mbps of data transfer rate to a Local Area Network (LAN)

8. LAN Port 2 (RJ-45)
This port allows up to 1000 Mbps of data transfer rate to a Local Area Network (LAN)

9. Firewire Port
This IEEE 1394a (Firewire) port is used to connect high speed audio/video and storage devices.

10. USB 2.0 Ports
These two 4-pin Universal Serial Bus (USB) ports are available for connecting USB 2.0 deivices.

11. USB 2.0 Ports
These two 4-pin Universal Serial Bus (USB) ports are available for connecting USB 2.0 deivices.

12. Microphone Jack
This pink jack connects to a microphone.

13. Rear Speaker Out
This gray jack connects to the rear speakers on 4-channel or better audio configurations.

14. External SATA Port
This port connects to an external SATA box or Serial ATA devices for advanced users.

15. Optical S/PDIF Out Port
This port connects to an external audio output device via an optical S/PDIF cable.

16. Coaxial S/PDIF Out Port
This port connects to an external audio output device via an coaxial S/PDIF cable.

17. PS/2 Keyboard Port
This purple 6-pin connector is for a PS/2 keyboard.